In Hampstead (NW3) the split is 84% flats to 17% houses over 11,433 households, and the stock is Georgian and early Victorian.
Because 45% of Hampstead is privately rented and 17% socially rented, a lot of NW3 work is agreed with a landlord or managing agent rather than the person opening the door.
Hampstead substrates run to with solid brick on the party and external walls, over lath and plaster over timber studs, which is why London Borough of Camden kerb rules get settled before the van is loaded. Nothing is drilled until the wall has been sounded, because a plasterboard plug spun into lime plaster; locally that also means which crumbles the key and drops the panel, which is what a 84% flat share across the ONS neighbourhood covering Hampstead actually produces is the mistake that costs a NW3 customer twice.
Georgian hill village of narrow lanes, artists' houses and the Heath on its doorstep. That character decides the practical detail of shed assembly here far more than the borough boundary does. Hampstead sits inside the Congestion Charge zone as well as ULEZ, so both are itemised on the quote rather than absorbed into an hourly rate.
On access, steep, narrow lanes where a 3.5t Luton is the practical maximum; several streets need a shuttle from Whitestone Pond — one reason one fitter for a small shed on a ready base; two for anything over 8x6ft or where roof panels need lifting together. Fitters travelling in use Hampstead (Northern).